Solidifying my Breath - 2012

Serpentinite reacts with carbon dioxide from my breath to produce two solid minerals (magnesite and silica) and water: Serpentine + carbon dioxide → magnesite + silica + water [Mg3[Si2O5(OH)4] + 3CO2 → 3MgCO3 + 2SiO2 + 2H2O]